US PATENT SUBCLASS 165 / DIG 228
WITH FAN OR PUMP

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 228WITH FAN OR PUMP {3}
DIG 229  DD  .~> Screw conveyor in pipe or tank
DIG 300  DD  .~> Injector-type pump {1}
DIG 302  DD  .~> Rotary gas pump {7}